<Item type="Activity Assignment" action="SqlLoad">
  UPDATE [ACTIVITY_ASSIGNMENT] set
   closed_on=NULLIF('@3',''),
   closed_by=(select id from [USER] where keyed_name='@4')	,
   comments=NULLIF('@5',''),
   path=NULLIF('@6',''),
   created_on=NULLIF('@7',''),
   modified_on=NULLIF('@8',''),
   created_by_id=(select id from [USER] where keyed_name='@9'),
   modified_by_id=(select id from [USER] where keyed_name='@10') 
  WHERE [ACTIVITY_ASSIGNMENT].source_id=(select id from [ACTIVITY] where [ACTIVITY].name='@2' and [ACTIVITY].id in (select related_id from [WORKFLOW_PROCESS_ACTIVITY] where source_id=(select related_id from [WORKFLOW] where source_id='@1')))
</Item>